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<div class="title">samples/tapi/squares.cpp</div>  </div>
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<p>A program using pyramid scaling, Canny, contours and contour simplification to find squares in the input image.</p>
<div class="fragment"><div class="line"></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d0/d9c/core_2include_2opencv2_2core_8hpp.html">opencv2/core.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../da/d74/ocl_8hpp.html">opencv2/core/ocl.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d1/d4e/utility_8hpp.html">opencv2/core/utility.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">opencv2/imgproc.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d6/d87/imgcodecs_8hpp.html">opencv2/imgcodecs.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d8/dcc/namespacestd.html">std</a>;</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> thresh = 50, N = 11;</div><div class="line"><span class="keyword">const</span> <span class="keywordtype">char</span>* wndname = <span class="stringliteral">&quot;Square Detection Demo&quot;</span>;</div><div class="line"></div><div class="line"><span class="comment">// helper function:</span></div><div class="line"><span class="comment">// finds a cosine of angle between vectors</span></div><div class="line"><span class="comment">// from pt0-&gt;pt1 and from pt0-&gt;pt2</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">double</span> angle( <a name="_a0"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> pt1, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> pt2, <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> pt0 )</div><div class="line">{</div><div class="line">    <span class="keywordtype">double</span> dx1 = pt1.<a name="a1"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a> - pt0.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a>;</div><div class="line">    <span class="keywordtype">double</span> dy1 = pt1.<a name="a2"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html#a157337197338ff199e5df1a393022f15">y</a> - pt0.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a157337197338ff199e5df1a393022f15">y</a>;</div><div class="line">    <span class="keywordtype">double</span> dx2 = pt2.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a> - pt0.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a>;</div><div class="line">    <span class="keywordtype">double</span> dy2 = pt2.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a157337197338ff199e5df1a393022f15">y</a> - pt0.<a class="code" href="../../db/d4e/classcv_1_1Point__.html#a157337197338ff199e5df1a393022f15">y</a>;</div><div class="line">    <span class="keywordflow">return</span> (dx1*dx2 + dy1*dy2)/<a name="a3"></a><a class="code" href="../../d0/de1/group__core.html#ga9070b6a3f093dd952d973819b06f4906">sqrt</a>((dx1*dx1 + dy1*dy1)*(dx2*dx2 + dy2*dy2) + 1e-10);</div><div class="line">}</div><div class="line"></div><div class="line"></div><div class="line"><span class="comment">// returns sequence of squares detected on the image.</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> findSquares( <span class="keyword">const</span> <a name="_a4"></a><a class="code" href="../../d7/d45/classcv_1_1UMat.html">UMat</a>&amp; image, vector&lt;vector&lt;Point&gt; &gt;&amp; squares )</div><div class="line">{</div><div class="line">    squares.clear();</div><div class="line">    <a class="code" href="../../d7/d45/classcv_1_1UMat.html">UMat</a> pyr, timg, gray0(image.<a name="a5"></a><a class="code" href="../../d7/d45/classcv_1_1UMat.html#a762e5567b5c5636f6c1de2c260b12065">size</a>(), <a name="a6"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga32b18d904ee2b1731a9416a8eef67d06">CV_8U</a>), gray;</div><div class="line"></div><div class="line">    <span class="comment">// down-scale and upscale the image to filter out the noise</span></div><div class="line">    <a name="a7"></a><a class="code" href="../../d4/d86/group__imgproc__filter.html#gaf9bba239dfca11654cb7f50f889fc2ff">pyrDown</a>(image, pyr, <a name="a8"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>(image.<a name="a9"></a><a class="code" href="../../d7/d45/classcv_1_1UMat.html#a18cc40c5ec8a6b95317e5fe6abaca6fc">cols</a>/2, image.<a name="a10"></a><a class="code" href="../../d7/d45/classcv_1_1UMat.html#a8137e5d25233b57db5616f227f1772ee">rows</a>/2));</div><div class="line">    <a name="a11"></a><a class="code" href="../../d4/d86/group__imgproc__filter.html#gada75b59bdaaca411ed6fee10085eb784">pyrUp</a>(pyr, timg, image.<a class="code" href="../../d7/d45/classcv_1_1UMat.html#a762e5567b5c5636f6c1de2c260b12065">size</a>());</div><div class="line">    vector&lt;vector&lt;Point&gt; &gt; contours;</div><div class="line"></div><div class="line">    <span class="comment">// find squares in every color plane of the image</span></div><div class="line">    <span class="keywordflow">for</span>( <span class="keywordtype">int</span> c = 0; c &lt; 3; c++ )</div><div class="line">    {</div><div class="line">        <span class="keywordtype">int</span> ch[] = {c, 0};</div><div class="line">        <a name="a12"></a><a class="code" href="../../d2/de8/group__core__array.html#ga51d768c270a1cdd3497255017c4504be">mixChannels</a>(timg, gray0, ch, 1);</div><div class="line"></div><div class="line">        <span class="comment">// try several threshold levels</span></div><div class="line">        <span class="keywordflow">for</span>( <span class="keywordtype">int</span> l = 0; l &lt; N; l++ )</div><div class="line">        {</div><div class="line">            <span class="comment">// hack: use Canny instead of zero threshold level.</span></div><div class="line">            <span class="comment">// Canny helps to catch squares with gradient shading</span></div><div class="line">            <span class="keywordflow">if</span>( l == 0 )</div><div class="line">            {</div><div class="line">                <span class="comment">// apply Canny. Take the upper threshold from slider</span></div><div class="line">                <span class="comment">// and set the lower to 0 (which forces edges merging)</span></div><div class="line">                <a name="a13"></a><a class="code" href="../../dd/d1a/group__imgproc__feature.html#ga04723e007ed888ddf11d9ba04e2232de">Canny</a>(gray0, gray, 0, thresh, 5);</div><div class="line">                <span class="comment">// dilate canny output to remove potential</span></div><div class="line">                <span class="comment">// holes between edge segments</span></div><div class="line">                <a name="a14"></a><a class="code" href="../../d4/d86/group__imgproc__filter.html#ga4ff0f3318642c4f469d0e11f242f3b6c">dilate</a>(gray, gray, <a class="code" href="../../d7/d45/classcv_1_1UMat.html">UMat</a>(), <a name="a15"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(-1,-1));</div><div class="line">            }</div><div class="line">            <span class="keywordflow">else</span></div><div class="line">            {</div><div class="line">                <span class="comment">// apply threshold if l!=0:</span></div><div class="line">                <span class="comment">//     tgray(x,y) = gray(x,y) &lt; (l+1)*255/N ? 255 : 0</span></div><div class="line">                <a name="a16"></a><a class="code" href="../../d7/d1b/group__imgproc__misc.html#gae8a4a146d1ca78c626a53577199e9c57">threshold</a>(gray0, gray, (l+1)*255/N, 255, <a name="a17"></a><a class="code" href="../../d7/d1b/group__imgproc__misc.html#ggaa9e58d2860d4afa658ef70a9b1115576a147222a96556ebc1d948b372bcd7ac59">THRESH_BINARY</a>);</div><div class="line">            }</div><div class="line"></div><div class="line">            <span class="comment">// find contours and store them all as a list</span></div><div class="line">            <a name="a18"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#gadf1ad6a0b82947fa1fe3c3d497f260e0">findContours</a>(gray, contours, <a name="a19"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#gga819779b9857cc2f8601e6526a3a5bc71a48b9c2cb1056f775ae50bb68288b875e">RETR_LIST</a>, <a name="a20"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#gga4303f45752694956374734a03c54d5ffa5f2883048e654999209f88ba04c302f5">CHAIN_APPROX_SIMPLE</a>);</div><div class="line"></div><div class="line">            vector&lt;Point&gt; approx;</div><div class="line"></div><div class="line">            <span class="comment">// test each contour</span></div><div class="line">            <span class="keywordflow">for</span>( <span class="keywordtype">size_t</span> i = 0; i &lt; contours.size(); i++ )</div><div class="line">            {</div><div class="line">                <span class="comment">// approximate contour with accuracy proportional</span></div><div class="line">                <span class="comment">// to the contour perimeter</span></div><div class="line"></div><div class="line">                <a name="a21"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#ga0012a5fdaea70b8a9970165d98722b4c">approxPolyDP</a>(contours[i], approx, <a name="a22"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#ga8d26483c636be6b35c3ec6335798a47c">arcLength</a>(contours[i], <span class="keyword">true</span>)*0.02, <span class="keyword">true</span>);</div><div class="line"></div><div class="line">                <span class="comment">// square contours should have 4 vertices after approximation</span></div><div class="line">                <span class="comment">// relatively large area (to filter out noisy contours)</span></div><div class="line">                <span class="comment">// and be convex.</span></div><div class="line">                <span class="comment">// Note: absolute value of an area is used because</span></div><div class="line">                <span class="comment">// area may be positive or negative - in accordance with the</span></div><div class="line">                <span class="comment">// contour orientation</span></div><div class="line">                <span class="keywordflow">if</span>( approx.size() == 4 &amp;&amp;</div><div class="line">                        fabs(<a name="a23"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#ga2c759ed9f497d4a618048a2f56dc97f1">contourArea</a>(approx)) &gt; 1000 &amp;&amp;</div><div class="line">                        <a name="a24"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#ga8abf8010377b58cbc16db6734d92941b">isContourConvex</a>(approx) )</div><div class="line">                {</div><div class="line">                    <span class="keywordtype">double</span> maxCosine = 0;</div><div class="line"></div><div class="line">                    <span class="keywordflow">for</span>( <span class="keywordtype">int</span> j = 2; j &lt; 5; j++ )</div><div class="line">                    {</div><div class="line">                        <span class="comment">// find the maximum cosine of the angle between joint edges</span></div><div class="line">                        <span class="keywordtype">double</span> cosine = fabs(angle(approx[j%4], approx[j-2], approx[j-1]));</div><div class="line">                        maxCosine = <a name="a25"></a><a class="code" href="../../db/de0/group__core__utils.html#gafa99ec4acc4ecb2dc3c2d05da15d0e3f">MAX</a>(maxCosine, cosine);</div><div class="line">                    }</div><div class="line"></div><div class="line">                    <span class="comment">// if cosines of all angles are small</span></div><div class="line">                    <span class="comment">// (all angles are ~90 degree) then write quandrange</span></div><div class="line">                    <span class="comment">// vertices to resultant sequence</span></div><div class="line">                    <span class="keywordflow">if</span>( maxCosine &lt; 0.3 )</div><div class="line">                        squares.push_back(approx);</div><div class="line">                }</div><div class="line">            }</div><div class="line">        }</div><div class="line">    }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">// the function draws all the squares in the image</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> drawSquares( <a class="code" href="../../d7/d45/classcv_1_1UMat.html">UMat</a>&amp; _image, <span class="keyword">const</span> vector&lt;vector&lt;Point&gt; &gt;&amp; squares )</div><div class="line">{</div><div class="line">    <a name="_a26"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> image = _image.<a name="a27"></a><a class="code" href="../../d7/d45/classcv_1_1UMat.html#a3d84c72c06ddd55d35b87c3d222d2674">getMat</a>(<a name="a28"></a><a class="code" href="../../dc/d84/group__core__basic.html#gga6226c29c7b0e7bda7aff72e96ba8e1dfafcb8f7013ace1726cd1bbeea800bc7b6">ACCESS_WRITE</a>);</div><div class="line">    <span class="keywordflow">for</span>( <span class="keywordtype">size_t</span> i = 0; i &lt; squares.size(); i++ )</div><div class="line">    {</div><div class="line">        <span class="keyword">const</span> <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a>* p = &amp;squares[i][0];</div><div class="line">        <span class="keywordtype">int</span> n = (int)squares[i].<a name="a29"></a><a class="code" href="../../df/d5b/namespacecv_1_1gapi_1_1streaming.html#a0a915e69f4cc8284293e40fc9ffbf157">size</a>();</div><div class="line">        <a name="a30"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga1ea127ffbbb7e0bfc4fd6fd2eb64263c">polylines</a>(image, &amp;p, &amp;n, 1, <span class="keyword">true</span>, <a name="a31"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0,255,0), 3, <a name="a32"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a85fdabe5335c9e6656563dfd7c94fb4f">LINE_AA</a>);</div><div class="line">    }</div><div class="line">}</div><div class="line"></div><div class="line"></div><div class="line"><span class="comment">// draw both pure-C++ and ocl square results onto a single image</span></div><div class="line"><span class="keyword">static</span> <a class="code" href="../../d7/d45/classcv_1_1UMat.html">UMat</a> drawSquaresBoth( <span class="keyword">const</span> <a class="code" href="../../d7/d45/classcv_1_1UMat.html">UMat</a>&amp; image,</div><div class="line">                            <span class="keyword">const</span> vector&lt;vector&lt;Point&gt; &gt;&amp; sqs)</div><div class="line">{</div><div class="line">    <a class="code" href="../../d7/d45/classcv_1_1UMat.html">UMat</a> imgToShow(<a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>(image.<a class="code" href="../../d7/d45/classcv_1_1UMat.html#a18cc40c5ec8a6b95317e5fe6abaca6fc">cols</a>, image.<a class="code" href="../../d7/d45/classcv_1_1UMat.html#a8137e5d25233b57db5616f227f1772ee">rows</a>), image.<a name="a33"></a><a class="code" href="../../d7/d45/classcv_1_1UMat.html#a65194dd922bef59b349a4148cd39d675">type</a>());</div><div class="line">    image.<a name="a34"></a><a class="code" href="../../d7/d45/classcv_1_1UMat.html#ab9f4b02e099696dc0fb43c85c6f4a2f1">copyTo</a>(imgToShow);</div><div class="line"></div><div class="line">    drawSquares(imgToShow, sqs);</div><div class="line"></div><div class="line">    <span class="keywordflow">return</span> imgToShow;</div><div class="line">}</div><div class="line"></div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>** argv)</div><div class="line">{</div><div class="line">    <span class="keyword">const</span> <span class="keywordtype">char</span>* keys =</div><div class="line">        <span class="stringliteral">&quot;{ i input    | ../data/pic1.png   | specify input image }&quot;</span></div><div class="line">        <span class="stringliteral">&quot;{ o output   | squares_output.jpg | specify output save path}&quot;</span></div><div class="line">        <span class="stringliteral">&quot;{ h help     |                    | print help message }&quot;</span></div><div class="line">        <span class="stringliteral">&quot;{ m cpu_mode |                    | run without OpenCL }&quot;</span>;</div><div class="line"></div><div class="line">    <a name="_a35"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html">CommandLineParser</a> cmd(argc, argv, keys);</div><div class="line"></div><div class="line">    <span class="keywordflow">if</span>(cmd.<a name="a36"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a8c41cf242b2ad8c0472e3b57893ef200">has</a>(<span class="stringliteral">&quot;help&quot;</span>))</div><div class="line">    {</div><div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;Usage : &quot;</span> &lt;&lt; argv[0] &lt;&lt; <span class="stringliteral">&quot; [options]&quot;</span> &lt;&lt; endl;</div><div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;Available options:&quot;</span> &lt;&lt; endl;</div><div class="line">        cmd.<a name="a37"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a84cda3794b765332bfe43bf8367222fb">printMessage</a>();</div><div class="line">        <span class="keywordflow">return</span> EXIT_SUCCESS;</div><div class="line">    }</div><div class="line">    <span class="keywordflow">if</span> (cmd.<a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a8c41cf242b2ad8c0472e3b57893ef200">has</a>(<span class="stringliteral">&quot;cpu_mode&quot;</span>))</div><div class="line">    {</div><div class="line">        <a name="a38"></a><a class="code" href="../../dc/d83/group__core__opencl.html#gab747fa4efd88d3188f4ebcbc8a639c1e">ocl::setUseOpenCL</a>(<span class="keyword">false</span>);</div><div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;OpenCL was disabled&quot;</span> &lt;&lt; endl;</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keywordtype">string</span> inputName = <a name="a39"></a><a class="code" href="../../d6/dba/group__core__utils__samples.html#ga3a33b00033b46c698ff6340d95569c13">samples::findFile</a>(cmd.<a name="a40"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a190215863579a6d244dccfd261ee0224">get</a>&lt;<span class="keywordtype">string</span>&gt;(<span class="stringliteral">&quot;i&quot;</span>));</div><div class="line">    <span class="keywordtype">string</span> outfile = cmd.<a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a190215863579a6d244dccfd261ee0224">get</a>&lt;<span class="keywordtype">string</span>&gt;(<span class="stringliteral">&quot;o&quot;</span>);</div><div class="line"></div><div class="line">    <span class="keywordtype">int</span> iterations = 10;</div><div class="line">    <a name="a41"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">namedWindow</a>( wndname, <a name="a42"></a><a class="code" href="../../d0/d90/group__highgui__window__flags.html#ggabf7d2c5625bc59ac130287f925557ac3acf621ace7a54954cbac01df27e47228f">WINDOW_AUTOSIZE</a> );</div><div class="line">    vector&lt;vector&lt;Point&gt; &gt; squares;</div><div class="line"></div><div class="line">    <a class="code" href="../../d7/d45/classcv_1_1UMat.html">UMat</a> image;</div><div class="line">    <a name="a43"></a><a class="code" href="../../d4/da8/group__imgcodecs.html#ga288b8b3da0892bd651fce07b3bbd3a56">imread</a>(inputName, <a name="a44"></a><a class="code" href="../../d8/d6a/group__imgcodecs__flags.html#gga61d9b0126a3e57d9277ac48327799c80af660544735200cbe942eea09232eb822">IMREAD_COLOR</a>).<a name="a45"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#a33fd5d125b4c302b0c9aa86980791a77">copyTo</a>(image);</div><div class="line">    <span class="keywordflow">if</span>( image.<a name="a46"></a><a class="code" href="../../d7/d45/classcv_1_1UMat.html#a8d0149f2671fd776444301cafa0eff8c">empty</a>() )</div><div class="line">    {</div><div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;Couldn&#39;t load &quot;</span> &lt;&lt; inputName &lt;&lt; endl;</div><div class="line">        cmd.<a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a84cda3794b765332bfe43bf8367222fb">printMessage</a>();</div><div class="line">        <span class="keywordflow">return</span> EXIT_FAILURE;</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keywordtype">int</span> j = iterations;</div><div class="line">    <a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga7cde0074dfd288f2d70c0e035dacb28a">int64</a> t_cpp = 0;</div><div class="line">    <span class="comment">//warm-ups</span></div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;warming up ...&quot;</span> &lt;&lt; endl;</div><div class="line">    findSquares(image, squares);</div><div class="line"></div><div class="line">    <span class="keywordflow">do</span></div><div class="line">    {</div><div class="line">        <a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga7cde0074dfd288f2d70c0e035dacb28a">int64</a> t_start = <a name="a47"></a><a class="code" href="../../db/de0/group__core__utils.html#gae73f58000611a1af25dd36d496bf4487">getTickCount</a>();</div><div class="line">        findSquares(image, squares);</div><div class="line">        t_cpp += <a class="code" href="../../db/de0/group__core__utils.html#gae73f58000611a1af25dd36d496bf4487">cv::getTickCount</a>() - t_start;</div><div class="line"></div><div class="line">        t_start  = <a class="code" href="../../db/de0/group__core__utils.html#gae73f58000611a1af25dd36d496bf4487">getTickCount</a>();</div><div class="line"></div><div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;run loop: &quot;</span> &lt;&lt; j &lt;&lt; endl;</div><div class="line">    }</div><div class="line">    <span class="keywordflow">while</span>(--j);</div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;average time: &quot;</span> &lt;&lt; 1000.0f * (double)t_cpp / <a name="a48"></a><a class="code" href="../../db/de0/group__core__utils.html#ga705441a9ef01f47acdc55d87fbe5090c">getTickFrequency</a>() / iterations &lt;&lt; <span class="stringliteral">&quot;ms&quot;</span> &lt;&lt; endl;</div><div class="line"></div><div class="line">    <a class="code" href="../../d7/d45/classcv_1_1UMat.html">UMat</a> result = drawSquaresBoth(image, squares);</div><div class="line">    <a name="a49"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(wndname, result);</div><div class="line">    <a name="a50"></a><a class="code" href="../../d4/da8/group__imgcodecs.html#gabbc7ef1aa2edfaa87772f1202d67e0ce">imwrite</a>(outfile, result);</div><div class="line">    <a name="a51"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>(0);</div><div class="line"></div><div class="line">    <span class="keywordflow">return</span> EXIT_SUCCESS;</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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